The default Discovery Protocol for a core group establishes network
connectivity between a new core group member and the other members of that
core group. Perform this task if you need to tune the default Discovery Protocol
behavior for a core group. The default value of 60 seconds, which is set by
the product installation process, provides an acceptable process detection
time for most situations.
Before you begin
- Understand the concepts that are described in the topic Core group
discovery and failure detection protocols.
- Verify that you are using the default Discovery and Failure Detection
providers. If you are using an alternative protocol provider, do not perform
the steps in this task because these steps only apply if you are using the
default discovery and failure detection providers.
- Determine how long you want the default Discovery Protocol to wait before
it recalculates the set of unconnected core group members, and attempts to
open connections to those members.
About this task
Use the administrative console or the wsadmin tool to adjust this
setting if it is not appropriate for your environment unless you are running
in a mixed cell environment that includes core groups that contain a mixture
of Version 7.0 and Version 6.x processes,
Mixed-version environment: If
you are running in a mixed cell environment, and you have core groups that
contain a mixture of Version 7.0 and Version 6.x processes, you must continue
to use the IBM_CS_UNICAST_DISCOVERY_INTERVAL_SECS core group custom property
to adjust how frequently the default Discovery Protocol attempts to open a
new network. To specify this custom property:
- In the administrative console, click core_group_name.
Then, in the Additional Properties section, click .
- In the field, specify IBM_CS_UNICAST_DISCOVERY_INTERVAL_SECS,
and specify a new time interval in the field.
mixv
To use the administrative console to change the wait interval
for the default Discovery Protocol, complete the following steps.
Procedure
- In the administrative console, click core_group_name.
- In the Additional Properties section, click . The option
must be selected. If this option is not selected, do not perform any more
of the steps in this task.
- Specify a new value for the property.
Decreasing this time interval might
improve the detection of core group members.
- Click OK and then click Review.
- Select Synchronize changes with nodes, and then click Save.
- Restart all members of the core group.
Results
After the servers restart, the core group members all run with the
new Discovery Protocol setting.